IC card

Details IC card IC card

1988-06-06

1989-06-27

Pitts, Harold I.

Registers

Records

235492, G06K 1900

Patent

active

048432245

ABSTRACT:
In IC card with a built-in IC, comprising an external power supply terminal and a solar battery, the external power supply terminal is connected to an IC internal power supply line through a first switch, the solar battery is connected to the IC internal power supply line through a second switch, and a voltage detection circuit is connected to the external power supply terminal. When the voltage detection circuit detects a voltage on the external power supply terminal, it switches ON the first switch and switches OFF the second switch. When it does not detect a voltage on the external power supply terminal it switches OFF the first switch and switches ON the second switch.

REFERENCES:
patent: 4575621 (1986-03-01), Dreifus

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